Players earn reward credits for each game they play, regardless of wins or loses, as long as the following criteria are met. 1. * The player survives at least 3 minutes. 2. * The player issues at least 10 commands that are not move or explore. 3. * The player does not forfeit and does not win because all opponents forfeited. If a player or opponents "suicide" (usually by turning their own cannons on themselves), it does not count as a forfeit. Several factors influence the amount of reward credits earned. Within the tower there are several ways to spend reward credits.